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terminal multiplexor with VT100/ANSI terminal emulation

screen is a terminal multiplexor that runs several separate "screens" on a
single physical character-based terminal. Each virtual terminal emulates a
DEC VT100 plus several ANSI X3.64 and ISO 2022 functions. Screen sessions
can be detached and resumed later on a different terminal.

Screen also supports a whole slew of other features. Some of these are:
configurable input and output translation, serial port support, configurable
logging, multi-user support, and utf8 charset support.